CVE-2021-46924

Summary

In the Linux kernel, the following vulnerability has been resolved:

NFC: st21nfca: Fix memory leak in device probe and remove

'phy->pending_skb' is alloced when device probe, but forgot to free in the error handling path and remove path, this cause memory leak as follows:

unreferenced object 0xffff88800bc06800 (size 512): comm "8", pid 11775, jiffies 4295159829 (age 9.032s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ……………. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ……………. backtrace: [<00000000d66c09ce>] __kmalloc_node_track_caller+0x1ed/0x450 [<00000000c93382b3>] kmalloc_reserve+0x37/0xd0 [<000000005fea522c>] __alloc_skb+0x124/0x380 [<0000000019f29f9a>] st21nfca_hci_i2c_probe+0x170/0x8f2

Fix it by freeing 'pending_skb' in error and remove.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux68957303f44a501af5cf37913208a2acaa6bcdf1 < 38c3e320e7ff46f2dc67bc5045333e63d9f8918daffected
LinuxLinux68957303f44a501af5cf37913208a2acaa6bcdf1 < a1e0080a35a16ce3808f7040fe0c3a8fdb052349affected
LinuxLinux68957303f44a501af5cf37913208a2acaa6bcdf1 < 1cd4063dbc91cf7965d73a6a3855e2028cd4613baffected
LinuxLinux68957303f44a501af5cf37913208a2acaa6bcdf1 < e553265ea56482da5700f56319fda9ff53e7dcb4affected
LinuxLinux68957303f44a501af5cf37913208a2acaa6bcdf1 < 238920381b8925d070d32d73cd9ce52ab29896feaffected
LinuxLinux68957303f44a501af5cf37913208a2acaa6bcdf1 < 1b9dadba502234eea7244879b8d5d126bfaf9f0caffected
LinuxLinux3.16affected
LinuxLinux0 < 3.16unaffected
LinuxLinux4.14.261 <= 4.14.*unaffected
LinuxLinux4.19.224 <= 4.19.*unaffected
LinuxLinux5.4.170 <= 5.4.*unaffected
LinuxLinux5.10.90 <= 5.10.*unaffected
LinuxLinux5.15.13 <= 5.15.*unaffected
LinuxLinux5.16 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References